function UUID() {
    let dt = new Date().getTime()
    let uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
        let r = (dt + Math.random() * 16) % 16 | 0
        dt = Math.floor(dt / 16)
        return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16).toUpperCase()
    })
    return uuid
}
module.exports = {UUID};
